PLATE LIII. 



Fig. 1. 

 Fig. 2. 

 Fig. 3. 

 Fig. 4. 



Baltznoptera borealis. 



Genital tract, dorsal view. Twice natural size. 

 Postcava, aorta and right kidney. Twice natural size. 

 Left lung, lateral view. H X natural size. 

 Pylorus and ampulla duodeni. Twice natural size. 



1. Umbilical artery. 



2. Bladder. 



3. Ovary. 



4. Cornu of uterus. 



5. Body of uterus. 



6. Vagina, proximal portion with folds. 



7. Vagina, distal portion. 



8. Ligamentum latum. 



9. Fold for ovarian vessels. 



10. Adrenal. 



11. Kidney. 



12. Ureter. 



13. Cavo-vertebral communication. 



14. Adrenal vein. 



15. Renal vein. 



16. Phrenic vein. 



17. Right postcava. 



18. Left postcava. 



19. Inferior mesenteric artery. 



20. Ovarian arteries. 



21. Caudal artery. 



22. Iliac artery. 



23. Groove for superior intercostal vein. 



24. Stomach, compartment 4. 



25. Pylorus. 



26. Ampulla duodeni. 



27. Orifice of bile duct. 



